/*
 * Copyright 2016 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.shell.standard;

import org.springframework.core.MethodParameter;
import org.springframework.shell.CompletionContext;

/**
 * Base class for {@link ValueProvider} that match by type. Subclasses {@literal C} will be selected for parameters
 * whose {@literal @}{@link ShellOption#valueProvider()} return the concrete class {@literal C}.
 *
 * @author Eric Bottard
 */
public abstract class ValueProviderSupport implements ValueProvider {

	@Override
	public boolean supports(MethodParameter parameter, CompletionContext completionContext) {
		ShellOption annotation = parameter.getParameterAnnotation(ShellOption.class);
		if (annotation == null) {
			return false;
		}
		return annotation.valueProvider().isAssignableFrom(this.getClass());
	}
}
